Enhance mem_replace_with_default with other constructors

[camsteffen]

mem_replace_with_default could recognize std library constructors that are equivalent to Default::default() such as Vec::new(), HashMap::new(), etc. This may also apply to #3812 when it is implemented, and the two lints may share a list of known "default-equivalent" constructors. vec![] should also be recognized.

Example: std::mem::replace(&mut v, Vec::new())

[mgacek8]

Hi, I'll give it a shot!
@rustbot claim